Cleanroom Design and Operations

Transcription

1 Cleanroom Design and Operations Philip J Denny USPAS Course: SRF Technology: Cleanroom Design and Operations January 2015 P. Denny

2 Topics Introduction Contamination Design Operation Monitoring Protocols, Materials, Processes Equipment Resources P. Denny USPAS SRF Course Jan

3 Introduction What is a cleanroom: ISO A room in which the concentration of airborne particles is controlled, and which is constructed and used in a manner to minimize the introduction, generation, and retention of particles inside the room and in which other relevant particles inside the room and in which other relevant parameters, e.g. temperature, humidity and pressure, are controlled as necessary. Airborne Particles Particles (dust) Airborne microbes (viruses) Aerosol and Chemical vapors (solvents) Airborne Molecular Contamination (AMC) Other Relevant Parameters Temperature, Humidity, Pressure Vibration-Noise Lighting Magnetic-Electromagnetic Flux Electro Static Discharge P. Denny USPAS SRF Course Jan

4 Who uses cleanrooms? Introduction Aerospace / Defense Semiconductor / Microelectronics Pharmaceuticals / Medical Device Healthcare / Hospitals Food Industrial (Auto, Solar, Optics, etc ) Research / University P. Denny USPAS SRF Course Jan

5 Introduction How do we get clean air and protect the room? Dilution With no air ventilation in a cleanroom, particles build up quickly. Ventilation expels contaminated air to the outside or recirculates through the filter system. Thus new make-up air dilutes existing air in the cleanroom. Air Changes Filtering Pre-Filters (Similar to house hold air filter) used for gross filtering outside air. Secondary Filters (MERV Filters) high efficiency (high velocity, low pressure drop). HEPA or ULPA Carbon Filtering / Gas-Phase air Filtration Airborne Molecular contamination (AMC) Isolation / segregation Cleanroom are isolated by walls ceiling and floor from other room. Entry and exiting of material and personnel is controlled through room of lower cleanliness zones Utilize independent HVAC systems Isolate particulate generating operations and personnel (garments/suits) Positive Pressure Clean air flow out to lower pressure areas Laminar Flow Moves particles to the air returns efficiently and quickly Suppress contaminates Cleaning & Maintenance Daily, Weekly, Monthly HVAC and Filter maintenance Materials & Equipment Approved materials and equipment design Protocols Rules for personnel conduct in the cleanrooms P. Denny USPAS SRF Course Jan

6 Introduction What cleanroom is right for your application? Where do you start? Product - Product Quality (clean, sterile, other) Cost (ISO 5 = $900 - $1200 / ft 2 ) Work / Process Flow (Product Mix, volume, change-over, key/critical steps) Regulation (FDA/USP, OSHA, EPA, DOD, Industry, Customer) Jlab SRF - Test Lab Addition classified space: ISO 4-9 = ~6100 ft 2 - Main Cleanroom and associated Chemistry rooms Cleanroom Contractor (DAW): ~2.5M Other CR specific construction: 4.0M+ P. Denny USPAS SRF Course Jan

7 Contamination - Particles Cleanroom Classification Cleanrooms are designated by ISO for particulate levels. Occupancy States As-Built, At-Rest, Operational As-Built: building complete and operational, but no equipment, materials, or personnel. At-Rest: no personnel, no work. Operational: specified number of personnel and process working. Cleanrooms are tested (certified) when built, then recertified annual or semiannually. Re-Certification can be performed at-rest or operational. P. Denny USPAS SRF Course Jan

8 Contamination - Particles Particles movement through the cleanroom air Gravity Ballistic force: particles ejected and move against prevailing air flow. Diffusion: thermal variation, Brownian motion. Currents: laminar or turbulent. Particles Adherence Friction Electrostatic adhesion Capillary adhesion Accretion particles sticking to other particles Van der Walls force P. Denny USPAS SRF Course Jan

9 Design - Airflow Conventional Semi-Laminar P. Denny USPAS SRF Course Jan

10 Design - Airflow Vertical Uni-directional Horizontal Uni-directional P. Denny USPAS SRF Course Jan

11 Design - Filtering HEPA vs ULPA High efficiency particulate arrestance or air (HEPA) Ultra-Low Particulate Air (ULPA) EN 1822, and IEST-RP-CC001 Filter HEPA ULPA P. Denny USPAS SRF Course Jan

12 Design HEPA/ULPA Fan Filter Unit Typically used in soft-wall and small modular cleanrooms. Ducted Filter Unit Typically used for modular or conventional cleanrooms. Gasket or Gel Sealed Filters - Found in open plenum conventional cleanrooms. P. Denny USPAS SRF Course Jan

13 Design-HEPA/ULPA How the HEPA/ULPA filter works: Straining / Sieving: particle diameter is simply too large for the space for it to flow through. Impaction / Impingement: particle hits a filter fibers and embeds into its surface. (particles>0.1 µm) Interception: particles are attracted and bonded via intermolecular adhesion (van der Waals force). (particles<0.1 µm) Diffusion: Brownian motion on small particles increasing likelihood of particle coming into contact with fibers. (particles<0.1 µm) Electrostatic Attraction: Uses large diameter charged fibers to attract much smaller particle with the opposite charge. (Special Filters Only) P. Denny USPAS SRF Course Jan

14 Design-HEPA/ULPA Air Velocity Carry particles faster to the return. Suppress particles on surfaces. Too High turbulence, operating cost, filter efficiency. Too Low no laminar flow, migration of particles, etc Test method used for unidirectional rooms per ISO Air Changes Dilution of air. Test method recommended by ISO for non-unidirectional rooms. Ceiling Design Ducted Filter Unit - used for modular or conventional cleanrooms. Gasket or Gel Sealed Filters - typical of open plenum and some FFU or ducted filter units. P. Denny USPAS SRF Course Jan

15 Design Cleanroom HVAC Block Diagram Make-up Air Units (MAU) Used to supply fresh air Keeps cleanroom pressurized Work-horse for dehumidification Pre-heat and Pre-cool Pre-filtering Humidification Uses high pressure spray of RO or DI to humidify air. Located in supply duct Supply Air Handler Units (AHU) Filtering Cooling Supply Plenum HEPA/ULPA Filters Diffusion Grids Lighting, Fire, etc Controls / Dampers/ Fans Outside Air Make-Up Air Handler Unit (MAU) Pre-Filter, De-humid., Pre-Heat/Cool Outside Air Humidification Air Handler Unit (AHU) Filtering, De/Humid., Heat/Cool (Supply) Air Handler (AHU) 2 nd Filter, De.humid., Cooling Humidification Supply ULPA/Plenum HEPA HEPA HEPA Cleanroom Cleanroom Scrubber Return Return Plenum Return P. Denny USPAS SRF Course Jan

16 Design - System Diagram Scrubber MAHU 3 MeeFog HUMD. AHU 3-1 AHU 3-5 AHU 3-2 AHU 3-6 AHU 3-3 AHU 3-7 AHU 3-4 Main Clean Room (Prod, R&D, etc..) String Airlocks (Pass-Thru) P. Denny USPAS SRF Course Jan

17 Design - VAA & Gowning Diagram AHU 3-9 VAA AHU 3-8 Gown Rm. 1,2,3 P. Denny USPAS SRF Course Jan Courtesy 17 of Phil Denny, Ron Bartek

18 Design Building Cross-Section Mechanical Mezzanine Supply Plenum Main Clean Room Return Floor Plenum P. Denny USPAS SRF Course Jan

19 Design - Cleanroom Layout Production Chemistry R&D Chemistry Pass-Thru PSA Production Support Area Pass-Thru Main Cleanroom VAA (Vertical Attachment Area) R&D Clean Analytical String Assembly String Pass-Thru Pass-Thru Gown RM 3 Gown RM 2 Gown RM 1 P. Denny USPAS SRF Course Jan

20 Design - Pressure/Flow Cascading positive pressurization. Production Chemistry ISO-8 R&D Chemistry ISO-8 Minimum of.02 wc between rooms. Pass-Thru ISO-5 PSA Production Support Area Pass-Thru ISO-5 Main Cleanroom (ISO-4 Cert.) VAA (Vertical Attachment Area) ISO-5 String Assembly ISO-5 R&D Clean Analytical ISO-5 Pass-Thru ISO-5 Pass-Thru ISO-5 Gown RM 3 ISO-5 Gown RM 2 ISO-6 Gown RM 1 ISO-7 P. Denny USPAS SRF Course Jan

21 Design Pressure/Flow P. Denny USPAS SRF Course Jan

22 Operations Process/Systems Monitoring Systems Monitoring Real-time monitoring for maintaining cleanroom systems. Particles Temperature, Humidity Pressure HVAC Status Other- AMC, Air Velocity, Gases Process Monitoring Local Particle measurements Other.. Systems Certification Air velocity, leaks particles, etc P. Denny USPAS SRF Course Jan

23 Operations JCI Control P. Denny USPAS SRF Course Jan

24 Operations JCI Control P. Denny USPAS SRF Course Jan

25 Operations JCI Control P. Denny USPAS SRF Course Jan

26 Operations - Monitoring Particles Airborne Particle Counters Types: Handhelds, Desktop, Remote Networkable and Software: Real-time, Historical, SPC, Alarms Typically 2-4 channels, from 0.3 to 10µm Additionally temperature, humidity, air velocity, etc. P. Denny USPAS SRF Course Jan

27 Operations Monitoring Particles Cleanroom particle counter operation: A vacuum pump pulls cleanroom air through an isokinetic probe at a known flow rate. The air sample is channeled through glass tube where the laser is targeted. Laser light reflected from the sample is collect and reflected by mirrors to a photodetector. The photo detector turns light energy into electrical energy proportional with the light intensity. The amplitude electrical current from the photodetector is calibrated to particle size. The counter has further circuitry, programing, and algorithms that ensure calibration and filter out noise. Output is normalized to usable data such as cts/m3 or cts /dl. P. Denny USPAS SRF Course Jan

28 Operations - Protocols General Cleanroom Regulations/Practices 1. Store all personal items before entering gown room. I.E. keys, watches, rings, matches, lighters and cigarettes. 2. Valuable personal Items such as wallets & cell phones are permitted, but they are NEVER removed from beneath the cleanroom garments. 3. NO eating, smoking, or gum chewing. 4. Only garments approved for the cleanroom should be worn. 5. Only approved cleanroom paper and pens shall be allowed in the cleanroom. NO PENCILS 6. No paper towels. Only cleanroom approved and rated wipes per cleanroom level. 7. Only approved and rated gloves allowed in cleanroom. 8. Gloves should not be allowed to touch any item or surface that has not been thoroughly cleaned. 9. Solvent contact with the bare skin should be avoided. They can remove skin oils and increase skin flaking. Approved skin lotions or lanolin based soaps are sometimes allowed. These can reduce skin flaking. 10. All items need for use in cleanroom shall be cleaned in Chemistry rooms and delivered via the pass-thru. No items shall enter the cleanroom through the gowning areas. 11. All tools, containers and fixtures used in the cleaning process should be cleaned to the same degree as the cleanroom surfaces. 12. NO tool should be allowed to rest on the surface of a bench or table. It should be place on a cleanroom wiper. Personal 1. Shower morning of or day of entering cleanroom. 2. Shorts and skirts are not recommended. And some fuzzy or high lint or static inducing fabrics. 3. If a smoker wait 30min before entering cleanroom and drink a minimum of 8oz of water. 4. No one who is physically ill may enter cleanroom. Including open sores, respiratory infections, and skin irritations should not work in the cleanroom. 5. NO cosmetics shall be worn in the cleanrooms. No make-up, mascara, powder, perfumes, or hair sprays. Personal Actions Typically Prohibited in Cleanrooms 1. Fast motions such as running, walking fast or horseplay. 2. Sitting or leaning on equipment or work surfaces. 3. Writing on equipment or garments. 4. Removal of items from beneath the cleanroom garments. 5. Wearing the cleanroom garment outside the cleanroom. 6. Wearing torn or soiled garments. P. Denny USPAS SRF Course Jan

29 Operations - Materials Prohibited Materials Paper Items paper towels, bags Tissues or unapproved wipes masking tape cardboard newsprint Natural fibers: cotton, wool Metals cold rolled steel (unfinished) galvanized steel zinc lead mercury cadmium and cadmium plated steel wool unfinished aluminum Other materials Mica, chalk, powders fiberglass, unsealed Sandpaper, pumice lapping compounds emery cloth, Scotch-brite lead pencils and erasers carbon typewriter and printer ribbons cloth tapes, e.g. duct tape wood products Aerosols, unconfined lubricants Books, notebooks, magazines Cotton Q-tips Open cell foam Velcro Bubble wrap Plastics bags Grease, oil, lubricants, dry lubricants Leather P. Denny USPAS SRF Course Jan

30 Operations - Processes PROHIBITED Processes Sawing Grinding, filing Lapping, polishing Thread cutting, tapping Scraping, deburing Drilling, reaming Welding, soldering Painting, coating Gluing, unapproved adhesives All actions that remove material Generation of fumes P. Denny USPAS SRF Course Jan

31 Operations - Equipment A note on clean room equipment and furniture Moving Parts: Muffin Fans, Belts, hinges, slides, motors, gears, etc Non Volatile lubricants(no dry powder, silicone), Low VOC Fabricated or assembled in a cleanroom, bagged for shipping. Laminar Flow Decontamination Hand Tools Stainless Exhaust Vacuum Approved materials FM Global 4910 Approved Materials Cleanroom Materials Flammability Test Protocol Materials Example: Polypropylene, Stainless* (304/316), Polypropylene, PVC, CPVC, PEEK, Aluminum* *Coatings/ Surface: Anodized Aluminum, Polished or Electro-polished SS, Powder Coat (25-60µm) P. Denny USPAS SRF Course Jan

32 Operations Equipment Mini-Environment Cleanroom within a cleanroom Designed for a unique process Airflow (Laminar, Velocities) Computational-Fluid Dynamics (CFD) Positive Pressure FFU Cost Savings IEST (RP) CC P. Denny USPAS SRF Course Jan

33 Resources Clean Room Standards ISO ISO Classification of Air Cleanliness ISO Specification for testing and monitoring.. ISO Test Methods ISO Design, Construction, and Start-up ISO SEMI - Semiconductor Equipment and Materials International Source for Standards and methods (especially equipment /systems, installation, design and materials) IEST Institute of Environmental Sciences and Technology IEST.org Cleanroom training / education Standards for contamination control, equipment design, etc. ( RPs/Recommended-Practices#TableCC ) Cleanroom Suppliers and Consultants Balancers / Certifiers National Environmental Balancing Bureau ( ) Cleanroom Construction Companies Cleanroom suppliers (equipment and consumables) Example: Tradeshows, Papers, etc P. Denny USPAS SRF Course Jan

34 Worlds largest ISO 7 HB Cleanroom Goddard 1.3m ft3 CH2MHill - ab 6, G7.5 (Cleanroom Area: 140,000m2) P. Denny USPAS SRF Course Jan